Perhaps he'd trust his little brother to defend him, right up to the moment he slits my throat.
Daenerys: Your sister pledged to send her army North.
Jaime: She did.
Daenerys: I don't see an army. I see one man ... with one hand. It appears your sister lied to me.
Jaime: She lied to me as well. She never had any intention of sending her army North. She has Euron Greyjoy's fleet and 20,000 fresh troops. The Golden Company from Essos, bought and paid for. Even if we defeat the dead, she'll have more than enough to destroy the survivors.
Jaime: I promised to fight for the living and I aim to keep that promise.
Tyrion: Your grace, I know my brother.
Daenerys: Like you knew your sister?
Tyrion: He came here alone, knowing full well how he would be received. Why do that if he weren't telling the truth?
Daenerys: Perhaps he'd trust his little brother to defend him, right up to the moment he slits my throat.